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POST
/
agent
/
v2
/
chat
/
{id}
/
respond
Respond to chat message (streaming)
curl --request POST \
  --url https://api.case.dev/agent/v2/chat/{id}/respond \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "<string>",
  "parts": [
    {
      "type": "text",
      "text": "<string>"
    }
  ]
}
'
"<string>"

Authorizations

​
Authorization
string
header
required

API key starting with sk_case_

Path Parameters

​
id
string
required

Chat session ID

Body

application/json

Message payload following the AI SDK UIMessage format. The body is passed through 1:1 to the underlying OpenCode session. Currently only text parts are supported.

​
model
string | null

Optional model override. When provided, the runtime bootstrap config is updated so subsequent turns use this model. Conversation history is preserved.

​
parts
object[]

Message content parts. Currently only "text" type is supported. Additional types (e.g. file, image) may be added in future versions.

Response

Turn-scoped normalized SSE stream

The response is of type string.